WO2017191566A1 - Overvoltage protection with indication of exceeded operating temperature - Google Patents
Overvoltage protection with indication of exceeded operating temperature Download PDFInfo
- Publication number
- WO2017191566A1 WO2017191566A1 PCT/IB2017/052554 IB2017052554W WO2017191566A1 WO 2017191566 A1 WO2017191566 A1 WO 2017191566A1 IB 2017052554 W IB2017052554 W IB 2017052554W WO 2017191566 A1 WO2017191566 A1 WO 2017191566A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- protection
- overvoltage protection
- status indicator
- overvoltage
- pole
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
- H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/12—Means structurally associated with spark gap for recording operation thereof
Definitions
- the technical solution is concerned to overvoltage protection devices, with at least one protection element, installed in the low voltage wiring or data and telecommunications networks specified for protection of electrical and electronic instruments and machinery against overvoltage.
- overvoltage protection used for protection of electronic and electrical equipment, they comprise protection elements, such as gas discharge tubes in two-pole or three-pole embodiment, varistors and semiconductor diodes. Protection elements are damaged due to exceeding limit values of pulse currents and/or temporary overvoltage (TOV) and/or low-value pulse currents with high frequency of occurrence. The damaged overvoltage protection loses its protection characteristics and it is necessary to replace it for a defect-free device.
- protection elements such as gas discharge tubes in two-pole or three-pole embodiment, varistors and semiconductor diodes.
- Protection elements are damaged due to exceeding limit values of pulse currents and/or temporary overvoltage (TOV) and/or low-value pulse currents with high frequency of occurrence.
- TOV temporary overvoltage
- the damaged overvoltage protection loses its protection characteristics and it is necessary to replace it for a defect-free device.
- overvoltage protection must be equipped with a device which can properly indicate the fact that the limit values of the protection member were exceeded.
- Overvoltage protection based on varistors must also be equipped with a disconnecting device which responds to exceeding the limit values by disconnecting the varistor from the supply network, or telecommunication line.
- the state of disconnection of the protection member shall be indicated via a suitable indicator.
- Overvoltage protection consisting of connecting a two-pole gas discharge tube and varistor with a disconnector, is used in, for example, the utility models - CZ 18902 "Varistor overvoltage protection", CZ 19812 “Varistor overvoltage protection with compact thermal disconnector” as well as CZ 292211 "Overvoltage protection device of terminal equipment for the electrical network”.
- the disconnector is designed to disconnect the flexible connection contact connected with the varistor terminal soldered on with a solder with a low interval of melting if the temperature of the varistor rises above the permitted limit.
- the disconnection force is due to the flexibility of the thermal disconnector or spring. If parameters change in the varistor, e.g.
- the installed electronic circuit evaluates the failure status and the status indicator indicates the failure by disconnecting the varistor.
- the simplest status indicator comprises a diode which lights up, or a glow tube.
- the overvoltage protection comprises at least one protection element from the group of a two-pole protection component, two-pole protection component complemented with a temperature dependent fuse or a three-pole protection component.
- the principle of the new design is that a status indicator is linked to all protection components used in the specified overvoltage protection with a temperature link.
- the status indicator comprises a temperature-sensitive layer with an irreversible change of colour in case the temperature is exceeded as a result of the damage of the protection members of the specified overvoltage protection.
- Protection components can be linked via the thermal link to one common status indicator, or each protection component is linked to its own status indicator via the thermal link.
- thermosensitive layer of the status indicator comprises in one possible design a paint which is directly coated on the protection components of the specific overvoltage protection, or coated on the thermo-conductive substrate positioned in a close distance from the protection members of the given overvoltage protection.
- thermo-sensitive layer of the status indicator consists of a film, with an advantageously self-adhesive label located directly on the protection components of the specific overvoltage protection. It is also possible to apply the film or the self-adhesive label onto the thermo-conductive substrate situated in a close distance from the protection members of the specific overvoltage protection.
- Fig. 1 shows the design of an overvoltage protection with a two-pole protection element, a temperature dependent fuse and status indicator linked to each other with a thermal link.
- Fig. 2 shows the design of an overvoltage protection with a two-pole protection element, a status indicator linked to each other with a thermal link without the temperature-dependent fuse.
- Fig. 3 shows the design of an overvoltage protection with a three-pole protection element and status indicator linked to each other using the thermal link without a temperature-dependent fuse.
- Fig. 4 shows the design of an overvoltage protection with three two-pole protection members, two temperature-dependent fuses and a status indicator linked to each other using a thermal link.
- Fig. 5 shows the design of an overvoltage protection with three two-pole protection members, two temperature-dependent fuses and three status indicators linked via a thermal link to the respective protection component and/or temperature dependent fuse.
- the overvoltage protection comprises at least one protection element from the group of the two-pole protection component 6, two-pole protection component 6 complemented with a temperature dependent fuse 8, three-pole protection component 7.
- Indication of exceeded operating temperature according to the new solution consists of all protection components used in the specific overvoltage protection linked via a thermal link to a status indicator 10 which comprises a thermosensitive layer with irreversible change of colour in case the temperature of the damaged protection members of the specific overvoltage protection is exceeded.
- Fig. 1 shows overvoltage protection which comprises one two-pole protection element 6 connected with its one end between the first input terminal 1 and the first output terminal 2. With its second end the two-pole protection component 6 is connected via a temperature dependent fuse 8 to the second input terminal 3 and, at the same time, it is interconnected with the second output terminal 4.
- a status indicator 10 is linked to both overvoltage protection elements via a thermal link 9. Similar design is indicated in Fig. 2 with a temperature-dependent fuse 8 left out.
- Fig. 3 shows the option of the design with a three-pole protection element 7, the medium pole of which is connected to the third input terminal 5 and to which a status indicator 10 is linked to the thermal link 9.
- the overvoltage protection in this figure comprises three two-pole protection members 6, connected in a star without an output common junction.
- Two protection two-pole elements 6 are connected in series and connected with their one external end via temperature-dependent fuses 8 to the first input terminal 1, or the second input terminal 3 and, at the same time, they are interconnected with the first output terminal 2, or the second output terminal 4.
- the third protection two-pole element 6 is connected between their common point and the third input terminal 5. All these protection components are linked via the thermal link 9 to the single status indicator 10.
- Fig. 5 is an option of the design with each protection component linked via the thermal link 9 to a separate status indicator 10, whereas protective two-pole elements 6 complemented with dependent fuses 8 are considered to be one protection component.
- the thermosensitive layer of the status indicator 10 may consist of a paint or a film, with an advantage in a form of a self-adhesive label. It is either applied directly onto the protection components of the specific overvoltage protection, or it can be created on the thermo-conductive substrate positioned in a close distance from the specific protection member. Should a temperature-dependent fuse 8 be used, the status indicator 10 should be located directly onto it.
- the temperature at which the protection member is damaged is known. Based on the temperature a specific thermosensitive layer of the status indicator 10 is chosen. If this temperature is exceeded, the protection member is damaged, and the thermosensitive layer of the status indicator 10 will permanently change its colour. It indicates the fact that the permitted temperature was exceeded, at which the temperature-dependent fuse disconnects and/or the protection member is damaged.
- the protection component consisting of a varistor is connected in series in compliance with standards with the temperature dependent fuse.
- the thermal link 9 is then carried out between all elements in such a manner that they are located next to each other and touch each other.
- the overvoltage protection with indication of exceeded operating temperature is a product which can be used where protection of electronic equipment and instruments from overvoltage is necessary, e.g. in installations of modern LED lighting systems, converters of photovoltaic systems, etc.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Fuses (AREA)
Abstract
An overvoltage protection with indication of exceeded operating temperature, where the overvoltage protection comprises at least one protection element from the group of a two-pole protection component (6), a two-pole protection component (6) complemented with a temperature dependent fuse (8), a three-pole protection component (7). All protection components used in the given overvoltage protection is linked via a thermal link (9) to the status indicator (10) consisting of a thermosensitive layer with irreversible change of colour in case a temperature of the destructed protection members of the overvoltage protection is exceeded.
Description
The technical solution is concerned to
overvoltage protection devices, with at least one
protection element, installed in the low voltage wiring
or data and telecommunications networks specified
for protection of electrical and electronic instruments
and machinery against overvoltage.
The current known designs consist of
overvoltage protection used for protection of electronic
and electrical equipment, they comprise protection
elements, such as gas discharge tubes in two-pole or
three-pole embodiment, varistors and semiconductor
diodes. Protection elements are damaged due to exceeding
limit values of pulse currents and/or temporary
overvoltage (TOV) and/or low-value pulse currents with
high frequency of occurrence. The damaged overvoltage
protection loses its protection characteristics and it
is necessary to replace it for a defect-free device.
According to the effective standards,
overvoltage protection must be equipped with a device
which can properly indicate the fact that the limit
values of the protection member were exceeded.
Overvoltage protection based on varistors must
also be equipped with a disconnecting device which
responds to exceeding the limit values by disconnecting
the varistor from the supply network, or
telecommunication line. The state of disconnection of
the protection member shall be indicated via a suitable indicator.
Overvoltage protection consisting of
connecting a two-pole gas discharge tube and varistor
with a disconnector, is used in, for example, the
utility models - CZ 18902 "Varistor overvoltage
protection", CZ 19812 "Varistor overvoltage protection
with compact thermal disconnector" as well as CZ 292211
"Overvoltage protection device of terminal equipment for
the electrical network". The disconnector is designed to
disconnect the flexible connection contact connected
with the varistor terminal soldered on with a solder
with a low interval of melting if the temperature of the
varistor rises above the permitted limit. The
disconnection force is due to the flexibility of the
thermal disconnector or spring. If parameters change in
the varistor, e.g. as a result of overloading, a low
current starts flowing through the varistor, after which
the varistor and the soldered connection with the
connecting contact heat up to the temperature when the
solder starts melting. The connection loses its firmness
and the flexible contact removes from the varistor
terminal and disconnects it from voltage. The installed
electronic circuit evaluates the failure status and the
status indicator indicates the failure by disconnecting
the varistor. The simplest status indicator comprises a
diode which lights up, or a glow tube.
A different design is described in DE 20204673
"Schutzkontaktsteckdose". This uses a design of a
two-pole gas discharge tube and varistor. The
disconnector comprises a temperature dependent fuse
connected in series with a varistor. In case of a
varistor failure the temperature dependent fuse
disconnects, which disconnects the varistor from
voltage. The evaluation of the failure status is also
carried out by an electronic circuit, whose disadvantage
is in this case that it constantly takes current.
Failures are indicated by heating up the illuminative
diode.
The disadvantage of these technical designs is
their complexity and expensiveness. However, none of the
above quoted documents focus on checking and indicating
exceeded limit values of the two-pole gas discharge
tube.
The disadvantages of the technical designs
stated above are eliminated by the design according to
DE 20 2012 002 281 (U1) "Überspannungsschutzgerät mit
einer Messeinrichtung zur Überwachung von einem oder
mehreren Überspannungsschutzelementen", which measures
and evaluates the load of the two-pole protection member
GDT using optic sensors OS1, OS2
and temperature sensors TS, connected to the
monitoring and assessment system CD, provided
with status indicators OUT1, OUT2, or with
added protection of a two-pole protection member
GDT by its short-circuiting (Fig. 1, Fig. 2).
Monitoring and evaluation system CD decides on
the status of the overvoltage protection using logical
procedure according to the network graph (Fig. 3).
The disadvantage of this design is that it is
complicated and expensive. The price makes it not
suitable for massively used overvoltage protection.
The above indicated disadvantages are
eliminated in overvoltage protection with indication of
exceeded operating temperature according to the
submitted solution. The overvoltage protection comprises
at least one protection element from the group of a
two-pole protection component, two-pole protection
component complemented with a temperature dependent fuse
or a three-pole protection component. The principle of
the new design is that a status indicator is linked to
all protection components used in the specified
overvoltage protection with a temperature link. The
status indicator comprises a temperature-sensitive layer
with an irreversible change of colour in case the
temperature is exceeded as a result of the damage of the
protection members of the specified overvoltage protection.
Protection components can be linked via the
thermal link to one common status indicator, or each
protection component is linked to its own status
indicator via the thermal link.
The thermosensitive layer of the status
indicator comprises in one possible design a paint which
is directly coated on the protection components of the
specific overvoltage protection, or coated on the
thermo-conductive substrate positioned in a close
distance from the protection members of the given
overvoltage protection.
In another possible design, the
thermo-sensitive layer of the status indicator consists
of a film, with an advantageously self-adhesive label
located directly on the protection components of the
specific overvoltage protection. It is also possible to
apply the film or the self-adhesive label onto the
thermo-conductive substrate situated in a close distance
from the protection members of the specific overvoltage protection.
The advantage of such indication of exceeded
operating temperature by means of a status indicator is
a simple construction, i.e. low cost and possibility to
check overloading of the protection member even in cases
a different technical solution is impossible,
particularly in case of gas discharge tubes and
semi-conductor diodes.
The technical solution will be explained in
more details using the attached drawings. Fig. 1 shows
the design of an overvoltage protection with a two-pole
protection element, a temperature dependent fuse and
status indicator linked to each other with a thermal
link. Fig. 2 shows the design of an overvoltage
protection with a two-pole protection element, a status
indicator linked to each other with a thermal link
without the temperature-dependent fuse. Fig. 3 shows the
design of an overvoltage protection with a three-pole
protection element and status indicator linked to each
other using the thermal link without a
temperature-dependent fuse. Fig. 4 shows the design of
an overvoltage protection with three two-pole protection
members, two temperature-dependent fuses and a status
indicator linked to each other using a thermal link.
Fig. 5 shows the design of an overvoltage protection
with three two-pole protection members, two
temperature-dependent fuses and three status indicators
linked via a thermal link to the respective protection
component and/or temperature dependent fuse.
Generally, the overvoltage protection
comprises at least one protection element from the group
of the two-pole protection component 6, two-pole
protection component 6 complemented with a temperature
dependent fuse 8, three-pole protection component 7.
Indication of exceeded operating temperature according
to the new solution consists of all protection
components used in the specific overvoltage protection
linked via a thermal link to a status indicator 10 which
comprises a thermosensitive layer with irreversible
change of colour in case the temperature of the damaged
protection members of the specific overvoltage
protection is exceeded.
The example in Fig. 1 shows overvoltage
protection which comprises one two-pole protection
element 6 connected with its one end between the first
input terminal 1 and the first output terminal 2. With
its second end the two-pole protection component 6 is
connected via a temperature dependent fuse 8 to the
second input terminal 3 and, at the same time, it is
interconnected with the second output terminal 4. A
status indicator 10 is linked to both overvoltage
protection elements via a thermal link 9. Similar design
is indicated in Fig. 2 with a temperature-dependent fuse
8 left out.
Fig. 3 shows the option of the design with a
three-pole protection element 7, the medium pole of
which is connected to the third input terminal 5 and to
which a status indicator 10 is linked to the thermal
link 9.
Another possible option is in Fig. 4. The
overvoltage protection in this figure comprises three
two-pole protection members 6, connected in a star
without an output common junction. Two protection
two-pole elements 6 are connected in series and
connected with their one external end via
temperature-dependent fuses 8 to the first input
terminal 1, or the second input terminal 3 and, at the
same time, they are interconnected with the first output
terminal 2, or the second output terminal 4. The third
protection two-pole element 6 is connected between their
common point and the third input terminal 5. All these
protection components are linked via the thermal link 9
to the single status indicator 10. Fig. 5 is an option
of the design with each protection component linked via
the thermal link 9 to a separate status indicator 10,
whereas protective two-pole elements 6 complemented with
dependent fuses 8 are considered to be one protection component.
The thermosensitive layer of the status
indicator 10 may consist of a paint or a film, with an
advantage in a form of a self-adhesive label. It is
either applied directly onto the protection components
of the specific overvoltage protection, or it can be
created on the thermo-conductive substrate positioned in
a close distance from the specific protection member.
Should a temperature-dependent fuse 8 be used, the
status indicator 10 should be located directly onto it.
In an overvoltage protection, the temperature
at which the protection member is damaged, is known.
Based on the temperature a specific thermosensitive
layer of the status indicator 10 is chosen. If this
temperature is exceeded, the protection member is
damaged, and the thermosensitive layer of the status
indicator 10 will permanently change its colour. It
indicates the fact that the permitted temperature was
exceeded, at which the temperature-dependent fuse
disconnects and/or the protection member is damaged.
The protection component consisting of a
varistor is connected in series in compliance with
standards with the temperature dependent fuse. The
thermal link 9 is then carried out between all elements
in such a manner that they are located next to each
other and touch each other.
Many other used types of design protection can
be considered apart from those shown in the examples,
and the status indicator can be used for all of them.
The overvoltage protection with indication of
exceeded operating temperature according to the
submitted solution is a product which can be used where
protection of electronic equipment and instruments from
overvoltage is necessary, e.g. in installations of
modern LED lighting systems, converters of photovoltaic
systems, etc.
Claims (7)
- An overvoltage protection with indication of exceeded operating temperature, where the overvoltage protection comprises at least one protection element from the group of a two-pole protection component (6), a two-pole protection component (6) complemented with a temperature dependent fuse (8), a three-pole protection component (7) comprising all protection components used in the given overvoltage protection is linked via a thermal link (9) to a status indicator (10) consisting of a thermosensitive layer with irreversible change of colour in case a temperature of the destructed protection members of the overvoltage protection is exceeded.
- The overvoltage protection according to Claim 1 wherein all protection components are linked via the thermal link (9) to one common status indicator (10).
- The overvoltage protection according to Claim 1 wherein each protection component is linked via the thermal link (9) to its own status indicator (10).
- The overvoltage protection according to Claim 1 and Claim 2 or 3 wherein the thermosensitive layer of the status indicator (10) consisting of a paint coated directly onto protection components of the overvoltage protection.
- The overvoltage protection according to Claim 1 and Claim 2 or 3 wherein the thermosensitive layer of the status indicator (10) consists of the paint coated onto the thermos-conductive substrate located in a close distance from the protection members of the overvoltage protection.
- The overvoltage protection according to Claim 1 and Claim 2 or 3 wherein the thermosensitive layer of the status indicator (10) consists of a film, with the advantage of a self-adhesive label located directly on the protection components of the overvoltage protection.
- The overvoltage protection according to Claim 1 and Claim 2 or 3 wherein the thermosensitive layer of the status indicator (10) consists of the film, with the advantage of the self-adhesive label located on the thermos-conductive substrate located in a close distance from the protection members of the overvoltage protection.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP17792583.1A EP3452794A4 (en) | 2016-05-03 | 2017-05-03 | Overvoltage protection with indication of exceeded operating temperature |
| CN201790001034.XU CN209639858U (en) | 2016-05-03 | 2017-05-03 | With the overvoltage protection for being more than processing temperature instruction |
| US16/097,627 US20190154520A1 (en) | 2016-05-03 | 2017-05-03 | Overvoltage protection with indication of exceeded operating temperature |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CZPUV2016-32340 | 2016-05-03 | ||
| CZ20163234 | 2016-05-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2017191566A1 true WO2017191566A1 (en) | 2017-11-09 |
Family
ID=60202826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2017/052554 WO2017191566A1 (en) | 2016-05-03 | 2017-05-03 | Overvoltage protection with indication of exceeded operating temperature |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2017191566A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114096820A (en) * | 2019-03-07 | 2022-02-25 | 泰连服务有限公司 | Isolated temperature sensing for electrical terminals |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3002385A (en) * | 1960-02-12 | 1961-10-03 | Pyrodyne Inc | Temperature indicator |
| US3254179A (en) * | 1964-01-07 | 1966-05-31 | Northern Electric Co | Mounting for communication line protector |
| US5502612A (en) * | 1992-07-08 | 1996-03-26 | Joslyn Manufacturing Company | Secondary surge arrester with isolating and indicating features |
| EP0915544B1 (en) * | 1997-11-08 | 2003-12-03 | ABB Schweiz AG | Surge arrester with a fault current indicating device |
| JP2005150657A (en) * | 2003-11-20 | 2005-06-09 | Central Japan Railway Co | Protector having deterioration indicator |
| US20090009921A1 (en) * | 2007-07-02 | 2009-01-08 | Phoenix Contact Gmbh & Co. Kg | Overvoltage protection element |
-
2017
- 2017-05-03 WO PCT/IB2017/052554 patent/WO2017191566A1/en unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3002385A (en) * | 1960-02-12 | 1961-10-03 | Pyrodyne Inc | Temperature indicator |
| US3254179A (en) * | 1964-01-07 | 1966-05-31 | Northern Electric Co | Mounting for communication line protector |
| US5502612A (en) * | 1992-07-08 | 1996-03-26 | Joslyn Manufacturing Company | Secondary surge arrester with isolating and indicating features |
| EP0915544B1 (en) * | 1997-11-08 | 2003-12-03 | ABB Schweiz AG | Surge arrester with a fault current indicating device |
| JP2005150657A (en) * | 2003-11-20 | 2005-06-09 | Central Japan Railway Co | Protector having deterioration indicator |
| US20090009921A1 (en) * | 2007-07-02 | 2009-01-08 | Phoenix Contact Gmbh & Co. Kg | Overvoltage protection element |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP3452794A4 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114096820A (en) * | 2019-03-07 | 2022-02-25 | 泰连服务有限公司 | Isolated temperature sensing for electrical terminals |
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